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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1476) listCorruptFileBlocks should be functional while the name node is still in safe mode
Date Tue, 24 Jan 2012 13:24:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13192143#comment-13192143
] 

Hudson commented on HDFS-1476:
------------------------------

Integrated in Hadoop-Mapreduce-trunk #968 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/968/])
    HDFS-2826. Add test case for HDFS-1476 (safemode can initialize replication queues before
exiting) (todd)

todd : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1235067
Files : 
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestSafeMode.java
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/NameNodeAdapter.java

                
> listCorruptFileBlocks should be functional while the name node is still in safe mode
> ------------------------------------------------------------------------------------
>
>                 Key: HDFS-1476
>                 URL: https://issues.apache.org/jira/browse/HDFS-1476
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.23.0
>            Reporter: Patrick Kling
>            Assignee: Patrick Kling
>             Fix For: 0.23.0
>
>         Attachments: HDFS-1476.2.patch, HDFS-1476.3.patch, HDFS-1476.4.patch, HDFS-1476.5.patch,
HDFS-1476.patch
>
>
> This would allow us to detect whether missing blocks can be fixed using Raid and if that
is the case exit safe mode earlier.
> One way to make listCorruptFileBlocks available before the name node has exited from
safe mode would be to perform a scan of the blocks map on each call to listCorruptFileBlocks
to determine if there are any blocks with no replicas. This scan could be parallelized by
dividing the space of block IDs into multiple intervals than can be scanned independently.

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